Danfoss VACON NX All-in-One Application Manual page 340

VACON® NX All-in-One
Application Guide
11.1.76 Fault 25 - Microprocessor watchdog fault, Subcode S2 - ASIC reset
Cause
• operation malfunction
• defective component
Troubleshooting
• Reset the fault and start the drive again.
• If the fault shows again, ask instructions from the local distributor.
11.1.77 Fault 26 - Start-up prevented, Subcode S1 - Prevention of accidental start-up
Cause
Start-up of the drive has been prevented. Run request is ON when new application is downloaded to the drive.
Troubleshooting
• Cancel prevention of start-up if it can be done safely.
• Remove Run request.
11.1.78 Fault 26 - Start-up prevented, Subcode S2 - RUN request is kept active after drive returns to
READY state from safe state
Cause
Start-up of the drive has been prevented. START command is ON when returning to READY state after Safe Disable has been active.
Troubleshooting
• Cancel prevention of start-up if it can be done safely.
• Remove Run request.
11.1.79 Fault 26 - Start-up prevented, Subcode S30 - RUN request given too quickly
Cause
Start-up of the drive has been prevented. START command is ON after system software or application was downloaded, or after
application was changed.
Troubleshooting
• Cancel prevention of start-up if it can be done safely.
• Remove Run request.
11.1.80 Fault 29 - Thermistor fault, Subcode S1 - Thermistor input activated on OPTAF board
Cause
The thermistor input of option board has detected increase of the motor temperature.
It is possible to set different responses in the application for this fault. See parameter group Protections.
Troubleshooting
• Do a check of the motor cooling and loading.
• Do a check of the thermistor connection.
• (If thermistor input of the option board is not in use it has to be short-circuited).
11.1.81 Fault 29 - Thermistor fault, Subcode S2 - Special application
Cause
The thermistor input of option board has detected increase of the motor temperature.
It is possible to set different responses in the application for this fault. See parameter group Protections.
Troubleshooting
• Do a check of the motor cooling and loading.
• Do a check of the thermistor connection.
• (If thermistor input of the option board is not in use it has to be short-circuited).
340 | Danfoss A/S © 2023.02
Fault Tracing
AB296635287482en-000301 / DPD00903